RuboCop: Enable previously disabled Style/RedundantRegexpEscape

Siddharth Asthanarequested to merge
edith007/gitlab:369268-rubocop-reneable-Style/RedundantRegexpEscape into master

What does this MR do and why?

This MR aims to solve the issue #369268 (closed)

Enable Style/RedundantRegexpEscape RuboCop

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